After Tuesday night’s Democratic sweep of the presidency and Senate, the Republican Party is likely wringing its hands over what went wrong and how to succeed going forward.

During an appearance on Comedy Central’s “The Colbert Report,” liberal Daily Beast blogger Andrew Sullivan suggested that there needs to be some major changes within the party. He said that conservatives should offer “constructive proposals” to ObamaCare and embrace climate change as apart of conservatism’s so-called revival.

When host Stephen Colbert asked Sullivan if there should be a “civil war” within the party, he replied:

“I hope so. I want conservatism to revive. I want it to be connected to reality, to what’s going on in the world, to the changing demographics of the society, the changing nature of the society and come up with constructive proposals to help solve our problems,” Sullivan said. “I want the Republican Party to make ObamaCare better rather than actually just abolish it.”

In addition to ObamaCare, Sullivan said Republicans should be proactive on climate change, an issue many conservatives have long dismissed as even existing. Sullivan added that losing the election would force the GOP to come to terms with these issues.

“I want the Republican Party to accept that climate change is happening, for goodness sake. And I don’t think they’ve been open to persuasion so far, but I think the one thing they understand is losing. And they believe they won by a landslide, they’re were telling us — George Will and Michael Barone were predicting — those are not crazies. They were mainstream Republican, very serious scholarly people, telling us it would be a landslide for Romney. Now, where do they go now?”